html,body{
    margin: 0;
    padding: 0;
}
.container{
    position: relative;
    width: 650px;
    height: 405px;
    margin: auto;
    top: 150px;
    border: 2px solid gray;
    border-radius: 10px;
    /* box-shadow: 10px 10px #ddd; */
    overflow: hidden;
}
.container .list{
    position: absolute;
    left: -650px;
    width: 4550px;
    height: 405px;
}
.container .list .picture{
    width: 650px;
    height: 405px;;
    float: left;
}
.container .buttons{
    position: absolute;
    z-index: 2;
    left: 200px;
    bottom: 12px;
    width: 300px;
    height: 5px;
}
.container .buttons .btn{
    width: 40px;
    height: 5px;
    background-color: #dddddd;
    float: left;
    margin-right: 20px;
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
}
.container .buttons .on{
    background-color: #999999;
}
.container a{
    font-size: 50px;
    color: #888888;
    z-index: 2;
    position: absolute;
    text-decoration: none;
    top: 40%;
}
.container .back{
    left: 20px;
}
.container .next{
    right: 20px;
}
.container .switch{
    display: none;
}
.container:hover .switch{
    display: block;
}
.container .switch:hover{
    font-weight: 900;
    color: #ea00ff;
}
